<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <script>
        function clickCounter()
        {
            if(typeof (Storage) !=="undefined")
            {
                if (sessionStorage.clickcount)
                {
                    sessionStorage.clickCount=
                    Number(sessionStorage.clickcount)+1;
                }
                else
                {
                    sessionStorage.clickcount = 1;
                }
                document.getElementById("result").innerHTML = 
                "在本 session 中，您已经点击这个按钮 " + sessionStorage.clickcount +
                " 次。";
            }
            else
            {
                document.getElementById("result").innerHTML="抱歉！您的浏览器不支持 Web Storage...";
            }
        }
        </script>
    </head>
    <body>
        <p>
            <button onclick="clickCounter()" type="button">请点击这里</button>
        </p>
        <div id="result"></div>
        <p>请点击按钮是计数器递增</p>
        <p>请关闭浏览器或标签页。然后再一次，计数器会重置。</p>
    </body>
</html>